kiji-express-music: EXP-228.  Update to match new ColumnRequest API.

Update references to "Column" to "QualifiedColumnRequestInput" and
"QualifiedColumnRequestOutput."

Update KijiInput and KijiOutput calls to match API introduced in
EXP-219 and EXP-220.

Increase heap size in pom.xml.
commit: https://github.com/kijiproject/kiji-express-music/commit/2d13aee68cc3c0909afedc513d32431f6c5d1d68